1 00:00:40,36 --> 00:00:44,37 I know where 2 00:00:52,58 --> 00:00:52,96 you are 3 00:00:52,96 --> 00:01:40,72 when you. 4 00:01:40,74 --> 00:01:41,77 Who has 5 00:01:50,27 --> 00:01:53,33 your home. 6 00:01:55,67 --> 00:01:58,59 Haven't heard about the wonderful things for me. 7 00:02:00,00 --> 00:02:04,87 That might give me a set of cards you want to see you take it from me on 8 00:02:04,87 --> 00:02:11,50 that really the way you are. 9 00:02:13,28 --> 00:02:17,22 It has. 10 00:02:18,17 --> 00:02:21,70 Let's go. 11 00:02:22,81 --> 00:02:32,19 Here we are. 12 00:02:32,90 --> 00:02:36,69 You know what's on your mind now. 13 00:02:38,07 --> 00:02:53,74 My friend you do you want you to put him through the work. 14 00:02:55,48 --> 00:03:00,54 You still around sixty will have to step up to ninety. 15 00:03:00,56 --> 00:03:02,84 When your mom you. 16 00:03:03,69 --> 00:03:15,03 Come right along with me. 17 00:03:15,05 --> 00:03:16,07 Not talking. 18 00:03:16,18 --> 00:03:26,05 Let's put on a new. 19 00:03:33,10 --> 00:03:44,05 One. 20 00:03:48,06 --> 00:03:49,92 Way. 21 00:04:00,00 --> 00:04:04,13 This Buddha motion picture camera which is taking pictures through this window. 22 00:04:05,04 --> 00:04:08,17 We use a soundproof room when it's close. 23 00:04:08,23 --> 00:04:10,30 It keeps the camera noise away from the microphone. 24 00:04:10,67 --> 00:04:15,16 The camera is operated by a motor which runs at exactly the same speed as the motor 25 00:04:15,16 --> 00:04:19,31 in the Sound Machine. Loulou it's hot in this move. 26 00:04:19,40 --> 00:04:21,23 Let's get out on the set again 27 00:04:21,23 --> 00:04:26,74 and I was out of the sound is picked up by the microphones on the stage sound waves 28 00:04:26,74 --> 00:04:31,46 are picked up by this wonderful mechanical ear the microphone which is really a 29 00:04:31,46 --> 00:04:36,90 glorified telephone transmitter this microphone changes the sound waves into 30 00:04:36,90 --> 00:04:39,86 electrical vibration which are amplified here 31 00:04:39,86 --> 00:04:42,02 and send along these wires to the mixer 32 00:04:42,02 --> 00:04:46,04 and the sounds from the stage microphones are mixed here so 33 00:04:46,04 --> 00:04:48,37 that the statue for the action in the production. 34 00:04:48,84 --> 00:04:51,65 Mr McNair's sees the actors through this window 35 00:04:52,37 --> 00:05:00,40 and hears them only through this horn up. 36 00:05:01,54 --> 00:05:07,32 Close. Now that we've got the sound right. 37 00:05:07,43 --> 00:05:11,90 I'll show you how it's amplified get ready. 38 00:05:16,69 --> 00:05:21,86 The power from the microphones is amplified about ten million times by these vacuum 39 00:05:21,86 --> 00:05:26,35 tubes making the voice current strong enough to operate the machine 40 00:05:26,35 --> 00:05:36,33 that photograph the sound so you follow me. 41 00:05:39,74 --> 00:05:43,35 This is the machine that is used to record the sound on film. 42 00:05:46,68 --> 00:05:51,64 This sound sound is traveling at the same rate of speed as the picture found in the 43 00:05:51,64 --> 00:05:52,14 camera 44 00:05:52,14 --> 00:05:58,92 but the light valve has to thin metal strings stretched across this tiny slit on 45 00:05:58,92 --> 00:06:00,64 one side of a sled. A strong light 46 00:06:00,64 --> 00:06:06,60 but on the other is a film moving at exactly the same speed as the picture camera 47 00:06:06,60 --> 00:06:11,35 in the studio the greatly Appel a five voice current passing through these tiny 48 00:06:11,35 --> 00:06:15,81 light bows strings move them to closer together or further apart. 49 00:06:16,12 --> 00:06:18,49 Thus changing the size of the site. 50 00:06:18,54 --> 00:06:23,39 Therefore the light varies as it passes through this rapidly changing opening 51 00:06:23,39 --> 00:06:27,40 leaving a true photographic record of the voice current the film 52 00:06:30,17 --> 00:06:36,49 sample in it now let's look at the films after they've been developed. 53 00:06:38,15 --> 00:06:44,86 Well here we are there are two negatives developed the next step is the print these 54 00:06:44,86 --> 00:06:49,10 two negatives onto a third piece of film. 55 00:06:49,11 --> 00:06:55,97 Will print the sound record first and then the picture record. 56 00:06:56,74 --> 00:06:59,60 Here we have a completed sound frame 57 00:06:59,60 --> 00:07:04,86 and we are now ready for projection. 58 00:07:05,59 --> 00:07:09,92 This is the picture and sound projector. 59 00:07:10,74 --> 00:07:16,94 One motor drive is both the picture and sound equipment. 60 00:07:16,96 --> 00:07:22,15 Let me illustrate this with a simple diagram this lamp illuminates the soundtrack 61 00:07:22,15 --> 00:07:27,87 on the film the light from the lamp passes through the slit drawing a very narrow 62 00:07:27,87 --> 00:07:34,63 line of brilliant light on the soundtrack as the film runs like 63 00:07:35,63 --> 00:07:38,80 the marks on the soundtrack cause the light to increase 64 00:07:38,80 --> 00:07:44,21 and decrease this light in turn causes the current through the photo electric cell 65 00:07:44,21 --> 00:07:45,66 to increase and decrease. 66 00:07:46,16 --> 00:07:51,71 That's reproducing the electric vibration first created by the sound wave the 67 00:07:51,71 --> 00:07:55,51 current from the photoelectric cell is stepped up by the amplifier 68 00:07:55,51 --> 00:07:59,80 and then this amplified current is carried by wire. 69 00:08:00,84 --> 00:08:07,75 Along with Mr Green on the say the connect with the 70 00:08:07,75 --> 00:08:11,54 loudspeaker. 71 00:08:11,56 --> 00:08:17,48 This is a typical layout of the stage set with two horns behind the screen the 72 00:08:17,48 --> 00:08:19,13 receivers connected to the heart 73 00:08:19,13 --> 00:08:24,33 and convert the electrical vibrations back into sound waves exactly the way the 74 00:08:24,33 --> 00:08:25,84 telephone receiver operates. 75 00:08:26,14 --> 00:08:26,46 So 76 00:08:26,46 --> 00:08:31,40 that while the picture is being shown the sound which was recorded is reproduced in 77 00:08:31,40 --> 00:08:35,26 step with the picture. 78 00:08:37,61 --> 00:08:39,39 The screen is full of small holes so 79 00:08:39,39 --> 00:08:43,82 that the horns may be placed behind the screen to let the sound through this gives 80 00:08:43,82 --> 00:08:47,65 the illusion that the sound is coming from the image of the speaker. 81 00:08:50,99 --> 00:08:54,61 Talking they're going to your cue your next onscreen music 82 00:08:54,62 --> 00:09:08,10 and Boatright on is no more right. 83 00:09:10,83 --> 00:09:16,87 Now. So I don't know about you doing his stuff I can get you. 84 00:09:19,27 --> 00:09:24,73 YOU YOU YOU 85 00:09:34,15 --> 00:09:41,11 YOU LOOK years my if you must stay on the screen 86 00:09:41,11 --> 00:09:41,47 with me. 87 00:09:41,58 --> 00:09:48,85 We get together was a little close harmony what he is saying who. 88 00:09:50,41 --> 00:09:50,45 You. 89 00:09:50,82 --> 00:09:57,81 You you. 90 00:10:04,10 --> 00:10:12,83 You go. 91 00:10:23,85 --> 00:10:29,14 You know 92 00:10:29,15 --> 00:10:38,17 that the who's who's.